July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Anomalous annual variation of cosmic rays in 24th solar cycle

Aug 4, 2015, 4:00 PM
Theater Foyer (World Forum)

Theater Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 20
Poster contribution SH-EX Poster 3 SH


Yury Balabin (Polar geophysical institute)


Analysis of data of world network neutron monitor (NM) has revealed the considerable annual variation of cosmic ray (CR) flux in 2011-2014. The variation observed at all stations: circumpolar, mid-latitude and subequatorial. It is present in the CR density changes obtained by the global survey. Annual variation is observed from 2011 to 2014. Phase variation is the same for all NM with a maximum in December - January and a minimum in June-July. Amplitude of a variation makes more than 1 percent. Variation absent all preceding years up to the seventies, where analysis also showed an annual variation in the period 1973-76. It is shown that in the same period of 2011-14 the quasi-annual variations of the interplanetary magnetic field (module IMF), the other parameters of the interplanetary medium (the speed, dynamic pressure solar wind) and the parameters of the solar magnetic field are observed. These variations are in good agreement with the identified CR variations. As the two possible causes are assumed: the features solar activity or asymmetry of a heliosphere.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 861

Primary author

Yury Balabin (Polar geophysical institute)


Dr Anatoly Belov (Pushkov institute of terrestrial magnetism, ionosphere and radio wave propagation) Ms Raisa Gushchina (Pushkov institute of terrestrial magnetism, ionosphere and radio wave propagation)

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